Single Area OSPF Configuration on Cisco IOS

OSPF Cisco Configuration

OSPF (Open Shortest Path First) protocol is a well-known routing protocol that is widely used today. To configure a network for OSPF properly, there are some steps. For basic OSPF Cisco Configuration, the following scenario will be a good example.

Cisco OSPF Configuration Steps

First of all, we will configure the routers’ interfaces. After that we will configure OSPF as our Routing Protocol. Here we assume that all the interfaces including loopback interfaces, their speed, duplex and descriptions have been configured.

To do OSPF Cisco Configuration, follow the below steps:

Enabling OSPF Process

In the router A, we will enable OSPF Process, with Process Number “1“.

A(config)# router ospf 1
A(config-router)#

Adding OSPF Networks

After enabling OSPF process on our Cisco Router A, then, we will add our networks that will be in OSPF network with their wildcard masks.

A(config-router)# network 10.10.10.0 0.0.0.255 area 0
A(config-router)# network 10.10.11.0 0.0.0.255 area 0
A(config-router)# end

Saving OSPF Config

To save our configuration, we will use “copy running-config startup-config” command.

A # copy running-config startup-config

OSPF Config on Router B

We will configure Router B like Router A. We will enable OSPF and then add OSPF Networks.

B(config)# router ospf 1
B(config-router)# network 10.10.11.0 0.0.0.255 area 0
B(config-router)# network 10.10.12.0 0.0.0.255 area 0
B(config-router)# exit
B # copy running-config startup-config

OSPF Config on Router C

We will configure Router C like Router A. We will enable OSPF and then add OSPF Networks.

C(config)# router ospf 1
C(config-router)# network 10.10.10.0 0.0.0.255 area 0
C(config-router)# network 10.10.12.0 0.0.0.255 area 0
C(config-router)# network 10.10.13.0 0.0.0.255 area 0
C(config-router)# end
C# copy running-config startup-config

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